Bartington PSU1 User manual

www.bartington.com
INNOVATION IN MAGNETICS
Telephone: [phone] •Fax: [phone] •Email: [email protected] •Website: www.bartington.com
Bartington Instruments Ltd
5, 8, 10, 11 & 12 Thorney Leys Business Park
Witney, Oxford, OX28 4GE. England
®The copyright of this document is the property of Bartington Instruments Ltd.
Bartington is a registered trademark of Bartington Instruments Limited in the following countries: Australia, Brazil, Canada, China, European Union, India,
Israel, Japan, Mexico, New Zealand, Norway, Russia, Singapore, South Korea, Switzerland, Turkey, United Kingdom, United States of America and Vietnam.
Operation Manual for
PSU1 Power Supply Unit
OM2443/4

BARTINGTON INSTRUMENTS
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Table of Contents
1. About this Manual 3
1.1. Symbols Glossary 3
2. Safe Use 3
3. Introduction to the PSU1 4
4. PSU1 Features 5
4.1. PSU1 Front Panel 5
4.2. Back Panel Connections and Controls 6
5. Compatibility 7
6. PSU1 Operation 7
6.1. Installing and Replacing the Internal Batteries 7
6.2. Initial Charging of the Battery Cells 10
6.3. Location of the Equipment 11
6.3.1. Potentially Hazardous Locations 11
6.3.2. Temperature 11
6.3.3. Proximity to Other Equipment 11
6.4. Connecting the Equipment 12
6.5. Using the PSU1 12
6.5.1. Switching On and Off 12
6.5.2. Filtering 12
6.5.3. Signal Buffering 13
6.6. PSU1 Ratings 13
7. Troubleshooting 14
8. Care and Maintenance 16
8.1. Fuses 16
8.2. Calibration 16
8.3. Cleaning 16
9. End of Life Disposal 17
9.1. Waste Electrical and Electronic Equipment (WEEE) Regulations 17

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1. About this Manual
This manual provides the information necessary to help customers install and operate the PSU1.
This manual should also be read in conjunction with the product brochure DS2520 and the unit’s
outline drawing DS2779 can also be found on the product page.
The PSU1 is compatible with a wide range of Bartington Instruments’ magnetometers. The
datasheet and operation of the sensor(s) used should also be read.
Photographs of key components are included, labelled with numbers. A number in the text in
square brackets [ ] refers to that label.
Caution: This manual applies only to the PSU1 Power Supply Unit. For the earlier Mag-
03PSU, please use the manual supplied with that unit or contact Bartington Instruments
[email protected]om.
1.1. Symbols Glossary
The following symbols used within this manual call your attention to specific types of
information:
WARNING: Indicates a situation in which serious bodily injury or death could result if the
warning is ignored.
Caution: Indicates a situation in which bodily injury or damage to your instrument, or both,
could result if the caution is ignored.
Identifies items that must be disposed of safely to prevent unnecessary damage to the
environment.
Note: Provides useful supporting information on how to make better use of your purchase.
2. Safe Use
WARNING: The PSU1 is fitted with AA size NiMH (Nickel Metal Hydride) rechargeable
batteries. Only AA size rechargeable batteries, which are specified as compatible in the
relevant product brochure, can be used in this product.
WARNING: The fitting of non-approved battery cells may be dangerous. It could affect the
safety of users, damage the equipment and also invalidate the terms and conditions of the
Warranty.

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WARNING: The PSU1 can also be powered by mains electricity and contains uninsulated
parts. Ensure that the unit is properly earthed at all times. Only properly trained personnel
should open the unit.
WARNING: These products are not qualified for use in explosive atmospheres or life
support systems. Consult Bartington Instruments for advice.
Note: When operating the PSU1 with the mains charger connected to the unit, it is
necessary to add an inductor over the magnetometer cable to, ensure compliance with BS
EN 55011.
A range of inductors suitable for all cable sizes is available from Bartington Instruments.
The inductor should be positioned as close to the PSU1 end of the cable as possible.
3. Introduction to the PSU1
The PSU1 provides a battery backed power supply of ±12V for most of Bartington Instruments
single and three-axis fluxgate magnetometers. It also contains filters for the analogue outputs of
the sensor. The analogue output are also available on the back panel of the PSU1 on three BNC
connectors for connection to a digital voltmeter or acquisition unit.

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4. PSU1 Features
4.1. PSU1 Front Panel
Figure 1. PSU1 Front Panel
1. Magnetometer Output Type Selector Switch
Balanced (button out)
Unbalanced (button pressed in)
Caution: This switch must be set to match your magnetometer output type to ensure
correct results. See the Product Compatibility Charts page on the website .
2. DC/AC Coupling (High Pass Filter (HPF) Control)
DC (button out)
AC (button pressed in)
3. Charge LED
4. On/Off LED
5. On/Off Switch
6. Socket for external charging adaptor
6 5
1 2 3 4

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4.2. Back Panel Connections and Controls
Figure 2. PSU1 Back Panel
7. X Signal Conditioned Output.
8. Y Signal Conditioned Output.
9. Z Signal Conditioned Output.
The three BNC connectors carry the conditioned analogue output voltages. The conditioned
outputs are the magnetometer X, Y and Z signals after they have been modified by the low/high
pass filters and, if a balanced output magnetometer is connected, converted to single-ended
signals.
10. Space for unique serial number.
11. Magnetometer socket for the connection of the magnetometer cable.
Note: Ensure correct orientation of the connector (indicated by the cut-out on the
connector body aligning with the notch in the socket).
7 8
11 10
9

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5. Compatibility
The PSU1 can operate with the majority of Bartington Instruments single and three-axis fluxgate
magnetometers. The complete list of compatible sensors is available here.
Please note that where the sensors are unpackaged, suitable cables for connection to the PSU1
may not be available. Please contact sal[email protected] for further details.
6. PSU1 Operation
6.1. Installing and Replacing the Internal Batteries
To install the battery cells, or to remove discharged or defective cells, use the following
procedure:
Key:
A – Enclosure lid retaining screw B – Enclosure lid retaining screw
C – Earth lead fixing (do not remove)
AB
C

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Place the PSU1 on a suitable surface with the underside facing up and the two enclosure lid
retaining screws nearest to you.
Using a flat-bladed screwdriver of the appropriate size, fully loosen screw A to allow the edge
of the lid to clear the enclosure end cap.
Fully loosen screw B and the lid of the enclosure will lift due to the internal springs.

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Lift the lid and place aside to gain access to the battery cell compartment.
Insert each cell into the compartment in turn.

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When all 5 cells are in place, locate the back edge of the lid in the enclosure.
A B
Tighten screws A and B in any order.
6.2. Initial Charging of the Battery Cells
To charge the PSU1 batteries, connect the mains charger and switch on the mains supply (if
appropriate). The charging LED [3] will begin to flash indicating that “fast charging” is taking
place. Once the fast charge cycle has completed, the LED will stop flashing and be lit (ON)
continuously, to indicate that “trickle charging” is continuing.
Note: When battery cells are inserted for the first time, they should be continuously
charged for 16 hours to ensure full capacity.
Note: The PSU1 can be used whilst charging the battery cells or used directly from mains
power without any battery cells being installed. However, the outputs may carry some
charger noise.
Note: If the PSU1 is powered by the mains charger with no battery cells installed, the
charging LED may flash. This is normal and can be ignored.
Note: The charging LED will switch off when the batteries are fully charged.
Note: To prepare for long periods away from a charging source, battery cells may be pre-
charged and used to replace discharged cells in the field.

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Note: If the battery voltage falls below 5V a warning buzzer will sound when the PSU1 is
switched on.
Note: Battery capacity will decrease over time, depending on age and use.
Caution: The operating temperature range is altered during battery charging.
6.3. Location of the Equipment
6.3.1. Potentially Hazardous Locations
WARNING: The charger supplied with this equipment is powered by mains electricity.
Do not use in wet or damp locations, where water may enter the unit and create a safety
hazard.
6.3.2. Temperature
To minimise temperature induced drift effects, position the PSU1:
• in a constant ambient temperature
• out of direct sunlight.
6.3.3. Proximity to Other Equipment
The PSU1 contains no high frequency electronics likely to cause emissions which could create
interference with other equipment. The unit is unlikely to be affected by interference from other
equipment in the normal operating environment.
Note: The PSU1 is built with ferromagnetic materials and should therefore be kept at least
1 metre away from any magnetometers.
Caution: The PSU1 should not be located in an environment with high radio frequency
noise as this would interfere with BNC connection to a DVM or Acquisition unit.

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6.4. Connecting the Equipment
Caution: Do not connect or break the connection between the magnetometer and the PSU1
with the PSU1 switched on, as this could cause damage to the magnetometer.
Connect the equipment in the following sequence:
1. Ensure the ON/OFF switch (item 5 above) is OFF (position “0”).
2. Connect the magnetometer to the PSU1 magnetometer socket [11]. Ensure the connector
pins are correctly aligned with those in the socket. The locking ring should be hand-tightened
only.
3. Connect BNC outputs to your external equipment, as required.
Note: When connected to the mains, the PSU1 will operate without any battery cells being
installed.
6.5. Using the PSU1
6.5.1. Switching On and Off
Caution: Connect the magnetometer before switching on the PSU1, as connecting a “live”
cable to the magnetometer may cause damage. Similarly, switch off the PSU1 before
disconnecting the magnetometer.
With the Power switch (item 5 above) ON (position “1”), the power LED (item 4) will be
continuously lit (ON).
Note: For best results, after switching on the power, leave the PSU1 for 20 minutes for the
internal temperature to stabilise, before performing any measurements.
6.5.2. Filtering
A permanent low-pass filter and selectable high-pass filter are provided for each channel: X, Y
and Z. Refer to product brochure DS2520 for the cut-off frequency of the filters.
The low-pass filters remove the high frequency noise components of the signal from the sensor.
The high frequency signal is associated with the excitation signal (breakthrough) of the fluxgate
sensor.
Note: The high-pass filters are intended to filter out the DC or static field component so
that the alternating components above the cut-off frequency of the filter can be isolated.
Note: The low pass filter inside the PSU1 will have a lesser effect on attenuating the
breakthrough of the low power sensors such as Mag648/649 with lower excitation
breakthrough (see datasheet for values).

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6.5.3. Signal Buffering
The input buffer is a differential instrumentation amplifier to minimise loading on input signals.
Note: Output must be selected as Balanced or Unbalanced, using the Magnetometer
Output Type Selector Switch, depending on the type of sensor connected.
When Unbalanced is selected, one input of each differential amplifier is connected to Signal
Ground, which is normally joined to Power Ground at the sensor, thereby eliminating the error
caused by voltage dropped in case long cables are used.
When Balanced is selected, both inputs of the differential amplifier are connected to the sensor.
In Balanced mode, the differential signals and input amplifiers give the best possible accuracy.
There is no interaction of signal ground currents and unequal sensor ground potentials caused
by different voltage drops in the Power Ground cabling. Compared to Unbalanced mode, this
configuration has the higher interference noise rejection, as noise will appear as a common
mode signal at the input amplifiers.
After filtering, each analogue signal is fed to the appropriate BNC connector via a low impedance
buffer. These buffers allow long cables to be used with high input impedance data acquisition
systems. Refer to product brochure DS2520 for maximum loads.
6.6. PSU1 Ratings
Refer to product brochure DS2520 or maximum environmental, electrical and mechanical ratings
for the PSU1.
Caution: Exceeding the maximum environmental ratings may cause irreparable damage to
the equipment.

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7. Troubleshooting
The PSU1 is unlikely to suffer any defects in normal use: no internal components are
serviceable. The most likely causes of failure, and their solutions, are detailed in the following
table.
In the event of any apparent malfunction beyond those described in the table below, please email
[email protected]om, or telephone the Bartington Instruments service team on +44 (0)1993
706565.
Fault Possible Cause Solution
No power output from
the PSU1 (when no mains
connected via the plug-in
charger adaptor)
Battery flat Recharge
Battery expired Replace batteries and
charge
Battery not fitted Fit batteries and charge
None of the above Return to Bartington
Instruments for repair
PSU1 does not charge when
mains connected via the
plug-in charger adaptor
Failed 12V charger Replace charger
Battery not fitted Fit batteries and charge
None of the above Return to Bartington
Instruments for repair
PSU1 does not hold its
charge (reduced battery
operation)
Batteries expired Replace batteries and
charge
PSU1 makes buzzing sound Battery voltage is below 5V Recharge
Buzzer sounds when
batteries have been
removed
Faulty 12V Charger Test charger output is 12V.
Replace charger.
Defective Component Return to Bartington
Instruments for repair
PSU1 stuck in AC or DC
coupling mode
Defective component Return to Bartington
Instruments for repair
PSU1 stuck in Balanced or
Unbalanced mode
Defective component Return to Bartington
Instruments for repair
One or both LEDs do not
light correctly
Defective component Return to Bartington
Instruments for repair

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With a sensor connected, all
output signals are faulty
Coupled incorrectly Check position of AC/DC
coupling switch
Balance mode set
incorrectly
Check position of balanced/
unbalanced mode switch
Defective sensor cable Check sensor cable using
relevant product brochure.
Return to Bartington
Instruments if found to be
defective
Sensor defective Return PSU1 and sensor to
Bartington Instruments for
repair
PSU1 defective Return PSU1 and sensor to
Bartington Instruments for
repair
With a sensor connected,
one or two output signals
are faulty
Defective sensor cable Check sensor cable using
relevant product brochure.
Return to Bartington
Instruments if found to be
defective
Sensor defective Return PSU1 and sensor to
Bartington Instruments for
repair
PSU1 defective Return PSU1 and sensor to
Bartington Instruments for
repair

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8. Care and Maintenance
The PSU1 requires no routine maintenance. There are no user serviceable parts.
Caution: Other than installing or replacing batteries as described in this manual, no
attempt should be made by a user to repair the unit. Repairs by unauthorised people
may be dangerous and could affect the safety of users, damage the equipment, and also
invalidate the terms and conditions of the Warranty.
8.1. Fuses
As a safety feature the PSU1 is fitted with a thermal fuse. If the PSU1 overheats, which could
occur as a result of the fitment of incorrect battery cells, the charging circuit will be permanently
isolated. The PSU1 must be returned to Bartington Instruments for checks and repair.
WARNING: No attempt should be made by the user to repair the unit. Repairs by
unauthorised personnel may be dangerous and could affect the safety of users, damage
the equipment and also invalidate the terms and conditions of the Warranty.
8.2. Calibration
Routine recalibration is recommended at two years interval. Please contact Bartington
Instruments [e-mail] for enquiries.
8.3. Cleaning
Caution: Disconnect the electrical supply before performing any cleaning operation.
Periodic cleaning is not normally required.
If the system becomes soiled and cleaning is necessary:
1. Use a damp cloth to clean the outer surfaces.
2. Use an air duster to blow debris from the connectors.
Caution: Ensure water does not enter the system. The system must be completely dry
before the electrical supply is reconnected.
Caution: Never use chemicals, such as solvents, when cleaning the PSU1.
Caution: Take particular care when cleaning around electrical connections. Bent or
damaged pins may cause the magnetometer to malfunction.

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9. End of Life Disposal
This product should not be disposed of in domestic or municipal waste. For information about
disposing of this product safely, check local regulations for disposal of electrical / electronic
products.
9.1. Waste Electrical and Electronic Equipment (WEEE) Regulations
This product complies fully with Restriction of the Use of Certain Hazardous Substances in
Electrical and Electronic Equipment (RoHS) and WEEE Regulations current at the time of
writing.

www.bartington.com
INNOVATION IN MAGNETICS
Telephone: [phone] •Fax: [phone] •Email: [email protected] •Website: www.bartington.com
Bartington Instruments Ltd
5, 8, 10, 11 & 12 Thorney Leys Business Park
Witney, Oxford, OX28 4GE. England
®The copyright of this document is the property of Bartington Instruments Ltd.
Bartington is a registered trademark of Bartington Instruments Limited in the following countries: Australia, Brazil, Canada, China, European Union, India,
Israel, Japan, Mexico, New Zealand, Norway, Russia, Singapore, South Korea, Switzerland, Turkey, United Kingdom, United States of America and Vietnam.